A no-heat call at 9pm doesn’t go to voicemail. It goes to whoever answers.
LinearZeta builds and runs a conversational AI receptionist for HVAC and home-services companies. It answers your calls on your existing number, books service visits, routes real emergencies to your on-call tech, and captures the jobs that ring out while your crew is on a roof.
The phone rings hardest when nobody can pick up.
- ■ Calls arrive while every tech is on a job — they hit voicemail, and the caller dials the next company on the list.
- ■ After-hours and cold-snap calls are your most urgent, highest-value work — and the most likely to ring out.
- ■ Your office manager can’t dispatch crews and answer the phone at the same time.
- ■ An answering service takes a message. It can’t book a job, and it can’t tell a reschedule from a burst pipe.
What the agent handles.
One voice agent on your number, answering on the first ring — 24/7, in a natural voice.
Books service visits
Offers real openings and books routine service and maintenance calls straight onto your calendar — day or night, while your crew keeps working. Callers can find, reschedule, or cancel an existing appointment by phone — no booking number needed, on a Google Calendar or Cal.com line; a Jobber line takes a message instead — and a customer who’s booked a visit through the agent before is offered their usual service with their usual technician.
Triages emergencies
Urgent language — no heat in winter, water where it shouldn’t be — routes straight to your office or on-call line, using rules you set in advance. A suspected gas leak triggers a fixed safety script: leave the building, call 911 and the gas company. No booking step in between.
Answers the routine questions
Hours, service area, maintenance plans — answered from your own information only. It never guesses.
Gets you the callback
When a call needs a human decision, the agent captures the name, number, and what the caller needs — emailed to you instantly, and texted once you opt in.
Where it stops. On purpose.
An agent on your line is only useful if you can trust what it says. Ours is bounded by design:
- ■ It never quotes a repair price or diagnoses equipment over the phone. Work that needs eyes on-site becomes a callback request, not a guess.
- ■ It never promises an arrival time it can’t actually book.
- ■ It opens every call by disclosing it’s an AI and that the call may be recorded.
- ■ Anything sensitive, uncertain, or heated goes to a person — instantly.
These limits come from our Map → Build → Govern → Measure method — mapped with you before launch, tested before every change goes live.
Booking that fits how you already work.
The agent books straight into your own Google Calendar — including a separate calendar per technician — or writes service requests straight into the Jobber account you already run. Don't run either? It books onto a Cal.com calendar we set up for you. On Google Calendar and Cal.com, callers can find, reschedule, or cancel a visit by phone with no booking number (a Jobber line takes a message for your office instead). All of it is included, along with a monthly tuning and review call.
One plan — $179 a month, everything included: caller memory, instant callback alerts, live emergency routing, every integration we list. 300 answered calls a month included, then $0.50 per answered call. No setup fee, month-to-month, 14-day free trial. See full pricing →
Common questions.
Can an AI receptionist really handle an HVAC emergency?
Yes — because emergencies are a bounded, high-priority path, not a conversation. The agent recognizes urgent language and routes the caller straight to your office or on-call line using rules you define in advance. A suspected gas leak triggers a fixed safety script — leave the building, call 911 and the gas company — with no booking step in between.
Will it quote prices for repairs?
No, by design. Repair pricing depends on what a tech finds on-site, so the agent never quotes it. It captures the job details and the caller’s contact information, emails your team instantly (and texts, once you opt in), and your office follows up with a real number.
Do I have to change my phone number?
No. Keep your existing business number — we connect it through Twilio with no carrier switch and no new hardware. Or we can provide a dedicated number if you’d rather keep your current line private.
Also built for: Salons & Spas · Fitness & Wellness · Law Firms · Real Estate · Nail Salons
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